(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Biodiversity Heritage Library | Children's Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "Text Book Of Mechanical Engineering"

748

Appendix /,
CHAPTER III.

P. 85.  Phosphor  Bronze. — The proportions by weight
are as follows : — .

Copper     ...    85

For ordinary uses

Ditto.

f   Cc

]   Ti

(   PI

r  cc

]   Ti

(   Pr

Tin
Phosphorus

15

Q'5
100*5

Copper     ...    90
Tin          ...      9

Phosphorus         "75

I'

Tough metal for piston rings
and eccentric linings

{Copper
Phosphor-tin      7

100

For bearings (heavy machinery){   ^5]£or-tin   ?s

100

CHAPTER IV.

V P. 102. Welding. — It has been shewn by Sir Thomas
Wrightson that the phenomenon of welding is akin to that
of regelation^ or the sticking together of ice under pressure. To
prove this an experiment was made which shewed a distinct
decrease in temperature (amounting to 106° F at 2550° F.) during
welding, a similar result being known to take place during rege-
lation. This abstraction of heat is caused by the melting of the
iron or ice in either case, and the consequent need of latent heat
for the liquefaction.

< P. 124. Case Hardening.—If two pieces of iron, forming
pin aad socket respectively, are to be case-hardened, and a good
working fit be finally required, it is important that the pin be
made a pretty tight fit in the socket before hardening. After the